There is something that I'd like to understand: while we have a few options for the simulation mode, they last only in the menu. Even if I select "model - 6502", when I acually play the game it switches to "widescreen tube" (from the look of it). The only change i can truly see during gameplay is setting it to off, which override the "widescreen tube" one.

Is this intended or a bug?

I am having the same issue. It's quite weird to be honest.